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drm/amd/display: add a NULL pointer check

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commit 0f48a4b83610cb0e4e0bc487800ab69f51b4aca6 upstream.

[Why & How]

We have to check if stream is properly initialized before calling
find_matching_pll(), otherwise we might end up trying to deferecence a
NULL pointer.

Cc: stable@vger.kernel.org # 6.1+
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Sung-huai Wang <danny.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sung-huai Wang 2023-06-06 14:28:38 +08:00 committed by Greg Kroah-Hartman
parent 3092beeb25
commit ad85fc99d6
1 changed files with 6 additions and 4 deletions
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4
drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
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@ -970,10 +970,12 @@ enum dc_status resource_map_phy_clock_resources(
|| dc_is_virtual_signal(pipe_ctx->stream->signal))
pipe_ctx->clock_source =
dc->res_pool->dp_clock_source;
else
else {
if (stream && stream->link && stream->link->link_enc)
pipe_ctx->clock_source = find_matching_pll(
&context->res_ctx, dc->res_pool,
stream);
}
if (pipe_ctx->clock_source == NULL)
return DC_NO_CLOCK_SOURCE_RESOURCE;